:root{
  --bg:#f3fbfb;
  --bg-warm:#fffaf1;
  --panel:#ffffff;
  --panel2:#edf8f7;
  --line:#dcebea;
  --ink:#102f46;
  --muted:#708493;
  --accent:#18b8b6;
  --accent2:#18b8b6;
  --accent-deep:#087f87;
  --accent-soft:#dff8f6;
  --navy:#0b3856;
  --coral:#ff7b6d;
  --yellow:#ffd66b;
  --ok:#168765;
  --warn:#c74b42;
  --shadow:0 16px 42px rgba(18,76,92,.09);
  --shadow-sm:0 6px 20px rgba(18,76,92,.07);
  --radius:22px;
  --bottom-nav-h:74px;
}
*{box-sizing:border-box}
html{min-height:100%;background:var(--bg)}
html,body{margin:0;padding:0}
body{
  min-height:100vh;
  background:
    radial-gradient(circle at 8% -10%,rgba(24,184,182,.15),transparent 31rem),
    radial-gradient(circle at 100% 14%,rgba(255,214,107,.15),transparent 24rem),
    var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic","Meiryo",sans-serif;
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
body.has-bottom-nav{padding-bottom:calc(var(--bottom-nav-h) + env(safe-area-inset-bottom))}
a{color:var(--accent-deep);text-decoration:none}
button,input,select,textarea{font:inherit}
.wrap{width:min(100%,880px);margin:0 auto;padding:18px 16px 44px}
.topbar{
  position:sticky;top:0;z-index:50;
  min-height:70px;padding:9px max(14px,env(safe-area-inset-left));
  display:flex;align-items:center;gap:10px;
  background:rgba(255,255,255,.9);
  border-bottom:1px solid rgba(220,235,234,.9);
  box-shadow:0 3px 18px rgba(18,76,92,.04);
  -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
}
.topbar .brand{display:flex;align-items:center;gap:10px;color:var(--navy);font-size:22px;font-weight:900;letter-spacing:-.03em}
.brand-logo{display:block;width:50px;height:50px;object-fit:contain}
.topbar .sp{flex:1}
.topbar a.mini{display:flex;align-items:center;gap:5px;color:var(--muted);font-size:13px;font-weight:700;white-space:nowrap}
.lang-dd{position:relative}
.lang-dd-btn{
  display:flex;align-items:center;gap:6px;max-width:160px;padding:7px 9px;
  background:#fff;border:1px solid var(--line);border-radius:13px;color:var(--ink);
  font:inherit;font-size:13px;line-height:1.4;cursor:pointer;
  box-shadow:0 3px 12px rgba(18,76,92,.04);
}
.lang-dd-btn .lang-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lang-dd-caret{color:var(--muted);font-size:10px}
.lang-dd-list{
  display:none;position:absolute;right:0;top:calc(100% + 7px);z-index:80;min-width:185px;
  padding:6px;background:#fff;border:1px solid var(--line);border-radius:16px;
  box-shadow:0 18px 45px rgba(13,55,76,.18);
}
.lang-dd.open .lang-dd-list{display:block}
.lang-dd-opt{display:flex;align-items:center;gap:9px;width:100%;padding:8px 10px;border:0;border-radius:10px;background:#fff;color:var(--ink);font:inherit;font-size:13px;text-align:left;cursor:pointer}
.lang-dd-opt:hover,.lang-dd-opt:focus{background:var(--panel2);outline:none}
.lang-dd-opt[aria-selected="true"]{font-weight:800;background:var(--accent-soft)}
.lang-flag{display:block;flex:0 0 22px;width:22px;height:15px;object-fit:cover;border:1px solid rgba(0,0,0,.12);border-radius:3px}
.card{
  background:rgba(255,255,255,.94);border:1px solid rgba(220,235,234,.95);
  border-radius:var(--radius);padding:18px;margin:14px 0;
  box-shadow:var(--shadow-sm);
}
.h1{font-size:23px;font-weight:900;color:var(--navy);letter-spacing:-.025em;margin:5px 0 12px}
.section-title{display:flex;align-items:center;gap:9px;color:var(--navy);font-weight:850;font-size:17px;margin-bottom:10px}
label{display:block;font-size:13px;font-weight:700;color:var(--muted);margin:12px 0 5px}
input,select,textarea{
  width:100%;padding:12px 13px;border:1px solid var(--line);border-radius:14px;
  font-size:16px;background:#fff;color:var(--ink);outline:none;
  transition:border-color .18s,box-shadow .18s;
}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 4px rgba(24,184,182,.11)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  min-height:44px;padding:10px 17px;border:0;border-radius:14px;
  background:linear-gradient(135deg,var(--accent),#20c7bd);color:#fff;
  font-size:15px;font-weight:850;cursor:pointer;
  box-shadow:0 7px 18px rgba(24,184,182,.2);
  transition:transform .16s,box-shadow .16s,filter .16s;
}
.btn:hover{filter:saturate(1.05);box-shadow:0 10px 24px rgba(24,184,182,.26)}
.btn:active{transform:translateY(1px)}
.btn.block{display:flex;width:100%}
.btn.sec{background:#fff;color:var(--navy);border:1px solid var(--line);box-shadow:none}
.btn.danger{background:linear-gradient(135deg,#d9544d,#c63f3a);color:#fff;box-shadow:0 7px 18px rgba(198,63,58,.2)}
.btn.sm{min-height:36px;padding:7px 11px;border-radius:11px;font-size:13px}
.muted{color:var(--muted)}
.small{font-size:13px}
.notice{background:#fff0ed;border:1px solid #ffd0ca;color:var(--warn);border-radius:14px;padding:11px 13px;margin:10px 0}
.flash{background:#e7f8f0;border:1px solid #c4ead9;color:var(--ok);border-radius:14px;padding:11px 13px;margin:10px 0}
hr{border:0;border-top:1px solid var(--line);margin:17px 0}
.code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;background:var(--panel2);border:1px solid var(--line);border-radius:13px;padding:10px 12px;word-break:break-all}
.row{display:flex;align-items:center;gap:10px}
.app-hero{
  position:relative;overflow:hidden;padding:24px;
  background:linear-gradient(135deg,#0c5369 0%,#129c9d 58%,#2bc8bd 100%);
  color:#fff;border:0;box-shadow:0 20px 46px rgba(12,83,105,.2);
}
.app-hero:before,.app-hero:after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.1)}
.app-hero:before{width:190px;height:190px;right:-70px;top:-100px}
.app-hero:after{width:120px;height:120px;left:-52px;bottom:-72px}
.app-hero>*{position:relative;z-index:1}
.app-hero .eyebrow{font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;opacity:.78}
.app-hero h1{font-size:29px;line-height:1.25;letter-spacing:-.035em;margin:7px 0}
.app-hero p{margin:0;color:rgba(255,255,255,.82);font-size:14px}
.quick-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:14px}
.quick-link{
  display:flex;min-height:105px;flex-direction:column;justify-content:space-between;
  padding:14px;border:1px solid var(--line);border-radius:18px;background:#fff;color:var(--navy);
  box-shadow:0 5px 16px rgba(18,76,92,.04);
}
.quick-link .quick-icon{display:flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:13px;background:var(--accent-soft);color:var(--accent-deep)}
.quick-link:nth-child(2) .quick-icon{background:#fff0ed;color:var(--coral)}
.quick-link:nth-child(3) .quick-icon{background:#fff7d8;color:#9a7214}
.quick-link b{font-size:14px}
.room-list{padding:5px 12px}
.room-item{display:flex;align-items:center;gap:12px;padding:13px 5px;border-bottom:1px solid var(--line);color:inherit}
.room-item:last-child{border-bottom:0}
.room-icon{display:flex;align-items:center;justify-content:center;flex:0 0 44px;width:44px;height:44px;border-radius:16px;background:var(--accent-soft);color:var(--accent-deep)}
.room-body{flex:1;min-width:0}
.room-name{display:block;font-size:15px;font-weight:850;color:var(--navy)}
.room-preview{display:block;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:12px;color:var(--muted)}
.room-unread{display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;min-width:24px;height:24px;padding:0 7px;border-radius:999px;background:var(--coral);color:#fff;font-size:12px;font-weight:900;line-height:1;box-shadow:0 4px 10px rgba(255,123,109,.25)}
.room-unread[hidden]{display:none}
.bottom-nav{
  position:fixed;left:50%;bottom:0;z-index:60;transform:translateX(-50%);
  width:min(100%,880px);height:calc(var(--bottom-nav-h) + env(safe-area-inset-bottom));
  padding:7px 12px calc(7px + env(safe-area-inset-bottom));
  display:grid;grid-template-columns:repeat(4,1fr);
  background:rgba(255,255,255,.94);border:1px solid rgba(220,235,234,.95);border-bottom:0;
  border-radius:22px 22px 0 0;box-shadow:0 -10px 35px rgba(18,76,92,.1);
  -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
}
.bottom-nav a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:#8598a3;font-size:10px;font-weight:800;border-radius:14px}
.bottom-nav a svg{width:21px;height:21px}
.bottom-nav a.on{color:var(--accent-deep);background:var(--accent-soft)}
.login-shell{max-width:430px;margin:26px auto}
.login-mark{display:block;width:96px;height:96px;object-fit:contain;margin:0 auto 4px}
.login-copy{text-align:center;margin-bottom:18px}
.login-copy .h1{margin-bottom:3px}
@media(max-width:520px){
  .wrap{padding:12px 12px 38px}
  .topbar{min-height:66px;padding:8px 10px}
  .brand-logo{width:50px;height:50px}
  .topbar .brand{font-size:20px;gap:6px}
  .topbar a.mini span{display:none}
  .lang-dd-btn .lang-name{display:none}
  .lang-dd-btn{padding:7px}
  .lang-dd-list{min-width:175px}
  .card{border-radius:20px;padding:16px;margin:11px 0}
  .app-hero{padding:21px 19px}
  .app-hero h1{font-size:25px}
  .quick-grid{gap:8px}
  .quick-link{min-height:96px;padding:12px}
}